My name is Will Pittenger. I have been making KMZ sets for Google Earth for a long time. After I starting making those, I wanted overlays for my sets. I was unsatisfied with the accuracy of the images available at Wikimedia Commons. So I started making my own with Inkscape and uploading them. Then I needed a place for anyone that liked my KMZ sets and/or maps to find others. For a while, a simple blog sufficed. But, once I started getting requests, I knew I needed something better. This site is the result. You are welcome to set up an account. Some activities are for registered users only. Take your time poking around and let me know what you think.

I included a map overlay, 4 polygons for track layouts, a path for pit
road, placemarks for each turn, and more for the main track. Then I
found two kart tracks. I added a total of 2 more pit road paths and 5
track layout polygons. You can get the KMZ here.

I included a map overlay, polygons for 15 different theoretical track
layouts, a path for the main pit road, 9 more paths for smaller
alternate pit roads on other parts of the track, placemarks for each
turn, and more. You can get the KMZ here.

I made a map overlay for this track. I then added 4 polygons for track
layouts, a path for pit road, placemarks for each turn, and more. To
that, I added information on not one, but two kart tracks. You can get the KMZ here.

I included a map overlay, 3 polygons for track layouts, a path for pit
road, placemarks for each turn, and more. I then added more of the same
for a kart track there. That has 19 layouts. You can get the KMZ here.

This track in Argentina is around the Lake Potrero de los Funes. It is
over 6 km in length. Of the tracks I have done, only the Nürburgring
Nordschleife ("Northern Loop") and Circuit des 24 Heures du Mans (Le
Mans) are longer.

I included a map overlay, two polygons for the
original and current versions of the track, a path for pit road,
placemarks for each turn, and more.

I knew there was a track in the area of Río Cuarto, Argentina. But it
took some work to find it. All I had was a mysterious link in a
Wikipedia box listing ciruits for Turismo Carretera and it mentioned Río
Cuarto. The Río Cuarto page on Wikipedia didn't mention any track.

So
I had no name, no coordinates. I put "Autódromo Río Cuarto" into
Google and got a hit. So I was able to make a map which became an
overlay. To that, I added 6 polygons for track configurations, a path
for pit road, placemarks for each turn, and more.

I then added 4
polygons and a path for a kart track plus placemarks for each turn
there. You can get the KMZ here.